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v4l2videodec: Implement v4l2videodec

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Implement an element that can driver V4L2 M2M decoder device.

https://bugzilla.gnome.org/show_bug.cgi?id=722128
This commit is contained in:
Nicolas Dufresne 2013-11-28 17:14:18 -05:00
parent 53ffd9e1ca
commit 61183670c0
5 changed files with 869 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
sys/v4l2/Makefile.am
View file

@ -18,6 +18,7 @@ libgstvideo4linux2_la_SOURCES = gstv4l2.c \
gstv4l2src.c \
gstv4l2radio.c \
gstv4l2tuner.c \
gstv4l2videodec.c \
gstv4l2vidorient.c \
v4l2_calls.c \
tuner.c \
@ -52,6 +53,7 @@ noinst_HEADERS = \
gstv4l2src.h \
gstv4l2radio.h \
gstv4l2tuner.h \
gstv4l2videodec.h \
gstv4l2vidorient.h \
gstv4l2videooverlay.h \
v4l2_calls.h \

3
sys/v4l2/gstv4l2.c
View file

@ -33,6 +33,7 @@
#include "gstv4l2src.h"
#include "gstv4l2sink.h"
#include "gstv4l2radio.h"
#include "gstv4l2videodec.h"
/* #include "gstv4l2jpegsrc.h" */
/* #include "gstv4l2mjpegsrc.h" */
/* #include "gstv4l2mjpegsink.h" */
@ -51,6 +52,8 @@ plugin_init (GstPlugin * plugin)
GST_TYPE_V4L2SINK) ||
!gst_element_register (plugin, "v4l2radio", GST_RANK_NONE,
GST_TYPE_V4L2RADIO) ||
!gst_element_register (plugin, "v4l2videodec", GST_RANK_PRIMARY + 1,
GST_TYPE_V4L2_VIDEO_DEC) ||
/* !gst_element_register (plugin, "v4l2jpegsrc", */
/* GST_RANK_NONE, GST_TYPE_V4L2JPEGSRC) || */
/* !gst_element_register (plugin, "v4l2mjpegsrc", */

757
sys/v4l2/gstv4l2videodec.c Normal file
View file

@ -0,0 +1,757 @@
/*
* Copyright (C) 2014 Collabora Ltd.
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstv4l2videodec.h"
#include "v4l2_calls.h"
#include <string.h>
#include <gst/gst-i18n-plugin.h>
#define DEFAULT_PROP_DEVICE "/dev/video8"
GST_DEBUG_CATEGORY_STATIC (gst_v4l2_video_dec_debug);
#define GST_CAT_DEFAULT gst_v4l2_video_dec_debug
#define parent_class gst_v4l2_video_dec_parent_class
G_DEFINE_TYPE (GstV4l2VideoDec, gst_v4l2_video_dec, GST_TYPE_VIDEO_DECODER);
static gboolean gst_v4l2_video_dec_flush (GstVideoDecoder * decoder);
enum
{
PROP_0,
V4L2_STD_OBJECT_PROPS,
PROP_CAPTURE_IO_MODE,
};
static void
gst_v4l2_video_dec_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
switch (prop_id) {
/* Split IO mode so output is configure through 'io-mode' and capture
* through 'capture-io-mode' */
case PROP_IO_MODE:
gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value,
pspec);
break;
case PROP_CAPTURE_IO_MODE:
gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
pspec);
break;
case PROP_DEVICE:
gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value,
pspec);
gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
pspec);
break;
/* By default, only set on output */
default:
if (!gst_v4l2_object_set_property_helper (self->v4l2output,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
}
}
static void
gst_v4l2_video_dec_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
switch (prop_id) {
case PROP_IO_MODE:
gst_v4l2_object_get_property_helper (self->v4l2output, prop_id, value,
pspec);
break;
case PROP_CAPTURE_IO_MODE:
gst_v4l2_object_get_property_helper (self->v4l2output, PROP_IO_MODE,
value, pspec);
break;
/* By default read from output */
default:
if (!gst_v4l2_object_get_property_helper (self->v4l2output,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
}
}
static gboolean
gst_v4l2_video_dec_open (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Opening");
if (!gst_v4l2_object_open (self->v4l2output))
goto failure;
if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
goto failure;
self->probed_sinkcaps = gst_v4l2_object_get_caps (self->v4l2output,
gst_v4l2_object_get_codec_caps ());
if (gst_caps_is_empty (self->probed_sinkcaps))
goto no_encoded_format;
self->probed_srccaps = gst_v4l2_object_get_caps (self->v4l2capture,
gst_v4l2_object_get_raw_caps ());
if (gst_caps_is_empty (self->probed_srccaps))
goto no_raw_format;
return TRUE;
no_encoded_format:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
(_("Encoder on device %s has no supported input format"),
self->v4l2output->videodev), (NULL));
goto failure;
no_raw_format:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
(_("Encoder on device %s has no supported output format"),
self->v4l2output->videodev), (NULL));
goto failure;
failure:
if (GST_V4L2_IS_OPEN (self->v4l2output))
gst_v4l2_object_close (self->v4l2output);
if (GST_V4L2_IS_OPEN (self->v4l2capture))
gst_v4l2_object_close (self->v4l2capture);
gst_caps_replace (&self->probed_srccaps, NULL);
gst_caps_replace (&self->probed_sinkcaps, NULL);
return FALSE;
}
static gboolean
gst_v4l2_video_dec_close (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Closing");
gst_v4l2_object_close (self->v4l2output);
gst_v4l2_object_close (self->v4l2capture);
gst_caps_replace (&self->probed_srccaps, NULL);
gst_caps_replace (&self->probed_sinkcaps, NULL);
return TRUE;
}
static gboolean
gst_v4l2_video_dec_start (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Starting");
gst_v4l2_object_unlock (self->v4l2output);
g_atomic_int_set (&self->active, TRUE);
self->output_flow = GST_FLOW_OK;
return TRUE;
}
static gboolean
gst_v4l2_video_dec_stop (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Stopping");
/* Should have been flushed already */
g_assert (g_atomic_int_get (&self->active) == FALSE);
g_assert (g_atomic_int_get (&self->processing) == FALSE);
gst_v4l2_object_stop (self->v4l2output);
gst_v4l2_object_stop (self->v4l2capture);
if (self->input_state) {
gst_video_codec_state_unref (self->input_state);
self->input_state = NULL;
}
GST_DEBUG_OBJECT (self, "Stopped");
return TRUE;
}
static gboolean
gst_v4l2_video_dec_set_format (GstVideoDecoder * decoder,
GstVideoCodecState * state)
{
gboolean ret = TRUE;
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Setting format: %" GST_PTR_FORMAT, state->caps);
if (self->input_state) {
if (gst_v4l2_object_caps_equal (self->v4l2output, state->caps)) {
GST_DEBUG_OBJECT (self, "Compatible caps");
goto done;
}
gst_video_codec_state_unref (self->input_state);
/* FIXME we probably need to do more work if pools are active */
}
ret = gst_v4l2_object_set_format (self->v4l2output, state->caps);
if (ret)
self->input_state = gst_video_codec_state_ref (state);
done:
return ret;
}
static gboolean
gst_v4l2_video_dec_flush (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Flushing");
/* Wait for capture thread to stop */
gst_pad_stop_task (decoder->srcpad);
self->output_flow = GST_FLOW_OK;
gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2output->pool));
gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2capture->pool));
/* Output will remain flushing until new frame comes in */
gst_v4l2_object_unlock_stop (self->v4l2capture);
return TRUE;
}
static gboolean
gst_v4l2_video_dec_negotiate (GstVideoDecoder * decoder)
{
return GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
}
static GstFlowReturn
gst_v4l2_video_dec_finish (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buffer;
if (!self->input_state)
goto done;
GST_DEBUG_OBJECT (self, "Finishing decoding");
/* Keep queuing empty buffers until the processing thread has stopped,
* _pool_process() will return FLUSHING when that happened */
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
while (ret == GST_FLOW_OK) {
buffer = gst_buffer_new ();
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
v4l2output->pool), buffer);
gst_buffer_unref (buffer);
}
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
g_assert (g_atomic_int_get (&self->processing) == FALSE);
if (ret == GST_FLOW_FLUSHING)
ret = self->output_flow;
GST_DEBUG_OBJECT (decoder, "Done draining buffers");
done:
return ret;
}
static GstVideoCodecFrame *
gst_v4l2_video_dec_get_oldest_frame (GstVideoDecoder * decoder)
{
GstVideoCodecFrame *frame = NULL;
GList *frames, *l;
gint count = 0;
frames = gst_video_decoder_get_frames (decoder);
for (l = frames; l != NULL; l = l->next) {
GstVideoCodecFrame *f = l->data;
if (!frame || frame->pts > f->pts)
frame = f;
count++;
}
if (frame) {
GST_LOG_OBJECT (decoder,
"Oldest frame is %d %" GST_TIME_FORMAT " and %d frames left",
frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
gst_video_codec_frame_ref (frame);
}
g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
return frame;
}
static void
gst_v4l2_video_dec_loop (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstBufferPool *pool;
GstVideoCodecFrame *frame;
GstBuffer *buffer = NULL;
GstFlowReturn ret;
GST_LOG_OBJECT (decoder, "Allocate output buffer");
/* We cannot use the base class allotate helper since it taking the internal
* stream lock. we know that the acquire may need to poll until more frames
* comes in and holding this lock would prevent that.
*/
pool = gst_video_decoder_get_buffer_pool (decoder);
ret = gst_buffer_pool_acquire_buffer (pool, &buffer, NULL);
g_object_unref (pool);
if (ret != GST_FLOW_OK)
goto beach;
/* Check if buffer isn't the last one */
if (gst_buffer_get_size (buffer) == 0)
goto beach;
GST_LOG_OBJECT (decoder, "Process output buffer");
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
v4l2capture->pool), buffer);
if (ret != GST_FLOW_OK)
goto beach;
frame = gst_v4l2_video_dec_get_oldest_frame (decoder);
if (frame) {
frame->output_buffer = buffer;
buffer = NULL;
ret = gst_video_decoder_finish_frame (decoder, frame);
if (ret != GST_FLOW_OK)
goto beach;
} else {
GST_WARNING_OBJECT (decoder, "Decoder is producing too many buffers");
gst_buffer_unref (buffer);
}
return;
beach:
GST_DEBUG_OBJECT (decoder, "Leaving output thread");
gst_buffer_replace (&buffer, NULL);
self->output_flow = ret;
g_atomic_int_set (&self->processing, FALSE);
gst_v4l2_object_unlock (self->v4l2output);
gst_pad_pause_task (decoder->srcpad);
}
static GstFlowReturn
gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstFlowReturn ret = GST_FLOW_OK;
GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
goto flushing;
if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2output))) {
if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps))
goto not_negotiated;
}
if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
GstVideoInfo info;
GstVideoCodecState *output_state;
GstBuffer *codec_data;
GST_DEBUG_OBJECT (self, "Sending header");
codec_data = self->input_state->codec_data;
/* We are running in byte-stream mode, so we don't know the headers, but
* we need to send something, otherwise the decoder will refuse to
* intialize.
*/
if (codec_data) {
gst_buffer_ref (codec_data);
} else {
codec_data = frame->input_buffer;
frame->input_buffer = NULL;
}
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
gst_v4l2_object_unlock_stop (self->v4l2output);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
pool), codec_data);
gst_v4l2_object_unlock (self->v4l2output);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
gst_buffer_unref (codec_data);
if (!gst_v4l2_object_setup_format (self->v4l2capture, &info, &self->align))
goto not_negotiated;
output_state = gst_video_decoder_set_output_state (decoder,
info.finfo->format, info.width, info.height, self->input_state);
/* Copy the rest of the information, there might be more in the future */
output_state->info.interlace_mode = info.interlace_mode;
gst_video_codec_state_unref (output_state);
if (!gst_video_decoder_negotiate (decoder)) {
if (GST_PAD_IS_FLUSHING (decoder->srcpad))
goto flushing;
else
goto not_negotiated;
}
}
if (g_atomic_int_get (&self->processing) == FALSE) {
/* It possible that the processing thread stopped due to an error */
if (self->output_flow != GST_FLOW_OK) {
GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
ret = self->output_flow;
goto drop;
}
GST_DEBUG_OBJECT (self, "Starting decoding thread");
/* Enable processing input */
gst_v4l2_object_unlock_stop (self->v4l2output);
/* Start the processing task, when it quits, the task will disable input
* processing to unlock input if draining, or prevent potential block */
g_atomic_int_set (&self->processing, TRUE);
gst_pad_start_task (decoder->srcpad,
(GstTaskFunction) gst_v4l2_video_dec_loop, self, NULL);
}
if (frame->input_buffer) {
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
pool), frame->input_buffer);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
if (ret == GST_FLOW_FLUSHING) {
if (g_atomic_int_get (&self->processing) == FALSE)
ret = self->output_flow;
}
/* No need to keep input arround */
gst_buffer_replace (&frame->input_buffer, NULL);
}
gst_video_codec_frame_unref (frame);
return ret;
/* ERRORS */
not_negotiated:
{
GST_ERROR_OBJECT (self, "not negotiated");
ret = GST_FLOW_NOT_NEGOTIATED;
goto drop;
}
flushing:
{
ret = GST_FLOW_FLUSHING;
goto drop;
}
drop:
{
gst_video_decoder_drop_frame (decoder, frame);
return ret;
}
}
static gboolean
gst_v4l2_video_dec_decide_allocation (GstVideoDecoder * decoder,
GstQuery * query)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
gboolean ret = FALSE;
if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
ret = GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
query);
return ret;
}
static gboolean
gst_v4l2_video_dec_src_query (GstVideoDecoder * decoder, GstQuery * query)
{
gboolean ret = TRUE;
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:{
GstCaps *filter, *result = NULL;
gst_query_parse_caps (query, &filter);
if (self->probed_srccaps)
result = gst_caps_ref (self->probed_srccaps);
else
result = gst_v4l2_object_get_raw_caps ();
if (filter) {
GstCaps *tmp = result;
result =
gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
}
GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
gst_query_set_caps_result (query, result);
gst_caps_unref (result);
break;
}
default:
ret = GST_VIDEO_DECODER_CLASS (parent_class)->src_query (decoder, query);
break;
}
return ret;
}
static gboolean
gst_v4l2_video_dec_sink_query (GstVideoDecoder * decoder, GstQuery * query)
{
gboolean ret = TRUE;
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:{
GstCaps *filter, *result = NULL;
gst_query_parse_caps (query, &filter);
if (self->probed_sinkcaps)
result = gst_caps_ref (self->probed_sinkcaps);
else
result = gst_v4l2_object_get_codec_caps ();
if (filter) {
GstCaps *tmp = result;
result =
gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
}
GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
gst_query_set_caps_result (query, result);
gst_caps_unref (result);
break;
}
default:
ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_query (decoder, query);
break;
}
return ret;
}
static gboolean
gst_v4l2_video_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
default:
break;
}
return GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
}
static GstStateChangeReturn
gst_v4l2_video_dec_change_state (GstElement * element,
GstStateChange transition)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (element);
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
g_atomic_int_set (&self->active, FALSE);
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}
static void
gst_v4l2_video_dec_dispose (GObject * object)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
gst_caps_replace (&self->probed_sinkcaps, NULL);
gst_caps_replace (&self->probed_srccaps, NULL);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_v4l2_video_dec_finalize (GObject * object)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
gst_v4l2_object_destroy (self->v4l2capture);
gst_v4l2_object_destroy (self->v4l2output);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_v4l2_video_dec_init (GstV4l2VideoDec * self)
{
GstVideoDecoder *decoder = (GstVideoDecoder *) self;
gst_video_decoder_set_packetized (decoder, TRUE);
self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
V4L2_BUF_TYPE_VIDEO_OUTPUT, DEFAULT_PROP_DEVICE,
gst_v4l2_get_output, gst_v4l2_set_output, NULL);
self->v4l2output->no_initial_format = TRUE;
self->v4l2output->keep_aspect = FALSE;
self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
V4L2_BUF_TYPE_VIDEO_CAPTURE, DEFAULT_PROP_DEVICE,
gst_v4l2_get_input, gst_v4l2_set_input, NULL);
self->v4l2capture->no_initial_format = TRUE;
self->v4l2output->keep_aspect = FALSE;
g_object_set (self, "device", DEFAULT_PROP_DEVICE, NULL);
}
static void
gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass)
{
GstElementClass *element_class;
GObjectClass *gobject_class;
GstVideoDecoderClass *video_decoder_class;
element_class = (GstElementClass *) klass;
gobject_class = (GObjectClass *) klass;
video_decoder_class = (GstVideoDecoderClass *) klass;
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
gst_v4l2_object_get_codec_caps ()));
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
gst_v4l2_object_get_raw_caps ()));
gst_element_class_set_static_metadata (element_class,
"V4L2 Video Decoder",
"Codec/Decoder/Video",
"Decode video streams via V4L2 API",
"Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>");
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize);
gobject_class->set_property =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_get_property);
video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_open);
video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_close);
video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_start);
video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_stop);
video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finish);
video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_flush);
video_decoder_class->set_format =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_format);
video_decoder_class->negotiate =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_negotiate);
video_decoder_class->decide_allocation =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_decide_allocation);
/* FIXME propose_allocation or not ? */
video_decoder_class->handle_frame =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_handle_frame);
video_decoder_class->sink_query =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_query);
video_decoder_class->src_query =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_src_query);
video_decoder_class->sink_event =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_event);
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_change_state);
gst_v4l2_object_install_properties_helper (gobject_class,
DEFAULT_PROP_DEVICE);
/**
* GstV4l2VideoDec:capture-io-mode
*
* Capture IO Mode
*/
g_object_class_install_property (gobject_class, PROP_IO_MODE,
g_param_spec_enum ("capture-io-mode", "Capture IO mode",
"Capture I/O mode",
GST_TYPE_V4L2_IO_MODE, GST_V4L2_IO_AUTO,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
"V4L2 Video Decoder");
}

81
sys/v4l2/gstv4l2videodec.h Normal file
View file

@ -0,0 +1,81 @@
/*
* Copyright (C) 2014 Collabora Ltd.
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef __GST_V4L2_VIDEO_DEC_H__
#define __GST_V4L2_VIDEO_DEC_H__
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/video/gstvideodecoder.h>
#include <gst/video/gstvideometa.h>
#include <gstv4l2object.h>
#include <gstv4l2bufferpool.h>
GST_DEBUG_CATEGORY_EXTERN (v4l2videodec_debug);
G_BEGIN_DECLS
#define GST_TYPE_V4L2_VIDEO_DEC \
(gst_v4l2_video_dec_get_type())
#define GST_V4L2_VIDEO_DEC(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_V4L2_VIDEO_DEC,GstV4l2VideoDec))
#define GST_V4L2_VIDEO_DEC_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_V4L2_VIDEO_DEC,GstV4l2VideoDecClass))
#define GST_IS_V4L2_VIDEO_DEC(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_V4L2_VIDEO_DEC))
#define GST_IS_V4L2_VIDEO_DEC_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_V4L2_VIDEO_DEC))
typedef struct _GstV4l2VideoDec GstV4l2VideoDec;
typedef struct _GstV4l2VideoDecClass GstV4l2VideoDecClass;
struct _GstV4l2VideoDec
{
GstVideoDecoder parent;
/* < private > */
GstV4l2Object * v4l2output;
GstV4l2Object * v4l2capture;
/* pads */
GstCaps *probed_srccaps;
GstCaps *probed_sinkcaps;
/* State */
GstVideoCodecState *input_state;
gboolean active;
gboolean processing;
GstFlowReturn output_flow;
GstVideoAlignment align;
};
struct _GstV4l2VideoDecClass
{
GstVideoDecoderClass parent_class;
};
GType gst_v4l2_video_dec_get_type (void);
G_END_DECLS
#endif /* __GST_V4L2_VIDEO_DEC_H__ */

26
sys/v4l2/v4l2_calls.c
View file

@ -47,6 +47,7 @@
#include "gstv4l2src.h"
#include "gstv4l2sink.h"
#include "gstv4l2videodec.h"
#include "gst/gst-i18n-plugin.h"
@ -58,6 +59,13 @@
#define V4L2_CID_VCENTER V4L2_CID_VCENTER_DEPRECATED
#endif
#ifndef V4L2_CAP_VIDEO_M2M
#define V4L2_CAP_VIDEO_M2M 0x00008000
#endif
#ifndef V4L2_CAP_VIDEO_M2M_MPLANE
#define V4L2_CAP_VIDEO_M2M_MPLANE 0x00004000
#endif
GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
#define GST_CAT_DEFAULT v4l2_debug
@ -581,6 +589,16 @@ gst_v4l2_open (GstV4l2Object * v4l2object)
V4L2_CAP_VIDEO_OUTPUT_MPLANE)))
goto not_output;
if (GST_IS_V4L2_VIDEO_DEC (v4l2object->element) &&
/* Today's M2M device only expose M2M */
!((v4l2object->vcap.capabilities & (V4L2_CAP_VIDEO_M2M |
V4L2_CAP_VIDEO_M2M_MPLANE)) ||
/* But legacy driver may expose both CAPTURE and OUTPUT */
((v4l2object->vcap.capabilities &
(V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_CAPTURE_MPLANE)) &&
(v4l2object->vcap.capabilities &
(V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_MPLANE)))))
goto not_m2m;
gst_v4l2_adjust_buf_type (v4l2object);
@ -650,6 +668,14 @@ not_output:
("Capabilities: 0x%x", v4l2object->vcap.capabilities));
goto error;
}
not_m2m:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Device '%s' is not a M2M device."),
v4l2object->videodev),
("Capabilities: 0x%x", v4l2object->vcap.capabilities));
goto error;
}
error:
{
if (GST_V4L2_IS_OPEN (v4l2object)) {